New speices of hammerhead shark discovered.

Scientists recently confirmed that endangered scalloped hammerhead sharks have a fishy twin — a newfound species, still unnamed, that is distinct, yet very closely resembles the threatened sharks.

The case of mistaken identity indicates that scalloped hammerhead sharks are even more scarce than once thought, according to some researchers.

Since it's very hard to tell the two species apart — only differences in their DNA and number of vertebrae reveal their true identities — it's likely that previous assessments of scalloped hammerhead sharks exaggerated their numbers because the counts likely included the look-alike sharks.